Little Mouse wrote: ↑Sat Jun 25, 2022 9:58 pm
There's always quicker or faster either someone else engine car combo or your own. There are those that think a 406 sbc why are you waisting time with that when you can use a bbc for drag racing. Its all about the fun factor in doing it whatever you choose for an engine.
The Reason I do it may sound crazy it's because my little 355 was built in 1995 for my brother's limited late-model dirt car.Of course my dad and grandpa decided it wasn't enough and had a bigger much more expensive engine built which lasted 2 races went boom.Back in went mini mouse,repeated this lord knows how many times in different classes from modified to latemodel.
She kept getting put on the stand thinking she is retired,but everytime a "good motor"would expire back in she went.
Dad,grandpa and sadly my little brother are gone now and minimouse is in my old beater bracket car and every time I fire the old girl up and make a pass I remember.
You got plenty of stall & gear, you just need to push peak power rpm up a bit & hold longer past peak.
I don't see a set of sportsman heads on a 350 being the bottleneck to more rpm.
Bigger heads will hurt airspeed & alloy heads need more comp to equal iron.
Bigger alloy heads will undoubtedly make more peak power, but area under the curve will suffer & recovery on the shifts will be slower.
More cam with the smaller heads on the other hand keeps airspeed up - it'll recover on the shifts better & make more below peak power.
The sportsman's *should* have enough cross section to hold power out to 7500 or so on a 350, you just need more cam to get it there.
The quickest combo's have heads that are just big enough for the required rpm, no bigger, cam specs to compliment the port sizing is far more important than raw cfm.
In other words forget swapping heads, throw cam at that b!tch.
Go with whatever combo that will add 100hp to the engine, assuming the last NA time slip you have is the 11.70.
At 3240lbs, it's gonna take almost 500hp to run 10.99s assuming the car setup will provide for perfect launches.
There's another guy here with plenty of Gen 2 Camaro small block experience that probably already has run a combo with your heads and can also suggest a cam.
Rick! wrote: ↑Mon Jun 27, 2022 7:19 pm
Go with whatever combo that will add 100hp to the engine, assuming the last NA time slip you have is the 11.70.
At 3240lbs, it's gonna take almost 500hp to run 10.99s assuming the car setup will provide for perfect launches.
There's another guy here with plenty of Gen 2 Camaro small block experience that probably already has run a combo with your heads and can also suggest a cam.
My last time slip is 11.30 N/A. Trying to do this with the parts I have now, my buddy said I should get some China heads and work them over but I don't want to go slower . I did test the AFR's on another 350 block and they are a no go for me as the chamber area is a lot bigger than the bore, so it's now between the two other sets of heads or I may do a set of Vortec truck heads like I did for my other 406 that worked so well with my tiny hyd cam that ran in the 10's.
mag2555 wrote: ↑Sat Jun 25, 2022 10:32 am
Thanks for the requested info, and I will reply back when I have more time later, but I also have a general question for everyone one here.
Why is it that so many folks participating in brackets always post up with questions as to how to make more power and go faster when the goal for any changes made to such a car should be oriented to producing better consistency, right?
I always seem to walk away scratch my head from post like this!
Bragging rights are great in terms of ET numbers, but being in the winner’s circle means more to me!
MAG-
Some of us like to test different things on our street / bracket cars to learn,
Some of us don't really care much about a plastic door stop ( trophy)
Some people on this forum find these results that us budget hobby guys put up interesting,
Instead of walking in circles and scratching your head put up some relevant information to the question or don't post .
I was going to put up my track results from last night but why bother,I would hate to be bragging.
Rant over
Steve PM me what you ran, I would be interested to know how well you did. Thanks.
Can you take more weight out the car? Back in 2008 I had a mild 351W with 9.5 compression TFS Highport 185 heads out the box and a Comp XE 274 hyd. roller in my 2900 lb. 85 Mustang LX with C-4 auto. 11 inch 2500 convert. and a 3.89 gear. It would run 11.50's at 120.
1980RS wrote: ↑Fri Jul 01, 2022 2:01 pm
Just picked up a 383 short block to re-build, Humm....could get interesting with some more cubes with the same parts.
I was running 65cc AFR 220 Comp heads on a 10.3:1 355. It had a solid roller Comp Cams 300BR-6, 264/270 @ .050, .630/.630, 106 lsa. I was shifting conservatively at first. Over time, I just kept raising the shift point, and it would run faster. I was pushing it to almost 8000 rpm through the traps... until it threw a rod through the pan.I should have spent more time dialing-in that combo.
427dart wrote: ↑Fri Jul 01, 2022 2:58 pm
Can you take more weight out the car? Back in 2008 I had a mild 351W with 9.5 compression TFS Highport 185 heads out the box and a Comp XE 274 hyd. roller in my 2900 lb. 85 Mustang LX with C-4 auto. 11 inch 2500 convert. and a 3.89 gear. It would run 11.50's at 120.
That would mean gutting the car and I don't want to do that.
ChopperScott wrote: ↑Fri Jul 01, 2022 8:32 pm
I was running 65cc AFR 220 Comp heads on a 10.3:1 355. It had a solid roller Comp Cams 300BR-6, 264/270 @ .050, .630/.630, 106 lsa. I was shifting conservatively at first. Over time, I just kept raising the shift point, and it would run faster. I was pushing it to almost 8000 rpm through the traps... until it threw a rod through the pan.I should have spent more time dialing-in that combo.
I like the specs on that cam. Sounds like your 355 was a screamer.
Ive made every head you have on your list go 10's in Street strip cars with 355ci. Like Knight said!!!! Your combo just needs to work better together. Cam for sure and those sportsman heads can be made pretty good. The Holley Strip dominator is hard to beat out of the box with port matching. If you had some decent porting done to the heads, cam. good carb and headers should be into the 10's pretty good.
If your hard set on head swap, the AFR's have some advantage as they are ported. You can port any of the heads you have on your list and get there too.
So, the AFR's[Im not a big fan of AFR]
Need a little more power/RPM should be right there.
T-flow wrote: ↑Thu Jul 07, 2022 9:18 pm
Ive made every head you have on your list go 10's in Street strip cars with 355ci. Like Knight said!!!! Your combo just needs to work better together. Cam for sure and those sportsman heads can be made pretty good. The Holley Strip dominator is hard to beat out of the box with port matching. If you had some decent porting done to the heads, cam. good carb and headers should be into the 10's pretty good.
If your hard set on head swap, the AFR's have some advantage as they are ported. You can port any of the heads you have on your list and get there too.
So, the AFR's[Im not a big fan of AFR]
Need a little more power/RPM should be right there.
It's funny as before I ran the Sportsman II's I had a set of older Phase 1 Bowtie heads on the car and while the Sportsman's were only a little quicker they were 3 mph faster so I have continued to use them. I put in the roller cam a couple of years ago and it helped a little over my old Elgin flat tappet 1090-P cam but the Elgin cam has always served me well in everything I had used it in. I am sure this roller cam is just a little too mild to get this 358 where I need it to be. While it will pull 7100 easy, it just might not be making any power up there with only 250°duration on a 108 LCA.
. I did test the AFR's on another 350 block and they are a no go for me as the chamber area is a lot bigger than the bore, so it's now between the two other sets of heads or I may do a set of Vortec truck heads like I did for my other 406 that worked so well with my tiny hyd cam that ran in the 10's.
