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Search found 25 matches

by dannobee
Thu Dec 05, 2019 7:06 pm
Forum: Engine Tech
Topic: Flat Plane V8 Race Engine - Single Exit Exhaust Question
Replies: 34
Views: 910

Re: Flat Plane V8 Race Engine - Single Exit Exhaust Question

What do the rules say regarding floor pan modifications? Can you put some version of asphalt late model crossover headers in it and fabricate a raised floorpan on the passenger side to fit a muffler and still maintain legal ground clearance?
by dannobee
Tue Dec 03, 2019 12:59 am
Forum: Engine Tech
Topic: Rod strength
Replies: 35
Views: 1036

Re: Rod strength

Back when I was working at a Chevy dealership and racing circle track late models, we'd build "claimer" engines for the lower division guys. When the PM rods came out and ample core engines were available, we figured what better place to check their durability. I never saw one fail. Period. Never ra...
by dannobee
Mon Dec 02, 2019 1:15 am
Forum: Engine Tech
Topic: 601 heads with light porting flow numbers
Replies: 5
Views: 211

Re: 601 heads with light porting flow numbers

You need more angles. Clean up the bowl with 60 and 75 deg cutters/stones and a 37 deg top cut. Check the contact point on the valve face. Back cut the intake valve at 30 deg to within about 0.020" of the contact point, then recheck the flow. I'm sure that others can add more to that, but that worke...
by dannobee
Sun Dec 01, 2019 10:53 am
Forum: Engine Tech
Topic: Would this concern you?
Replies: 9
Views: 572

Re: Would this concern you?

Re: carb studs and wingnuts. What we did (circle track racer forever) was use all-thread with loctite AND a jamb nut on the carb end of the stud, then put the air cleaner on, then put on a wing nut made of all nylon, no brass/steel insert, hard to screw on the whole way (some cheap aftermarket one w...
by dannobee
Sat Nov 30, 2019 9:21 am
Forum: Engine Tech
Topic: Would this concern you?
Replies: 9
Views: 572

Re: Would this concern you?

Was it just me, or did anyone else think nothing of the tick marks and immediately go to how the head needed a proper valve job? :lol:

No problem running that thing at all. Zero hesitation.
by dannobee
Fri Nov 29, 2019 3:23 pm
Forum: Engine Tech
Topic: Education time....what were these used for?
Replies: 10
Views: 765

Re: Education time....what were these used for?

Gaerte is out of business and the assets auctioned, so no help there. Earl passed away years ago. But they were big in circle track racing, specifically sprint cars. If we go in knowing that, the 3.76" stroke with a 4.155" bore gets us 408 inches, pretty close to a 410 sprinter, with a tad left for ...
by dannobee
Thu Nov 28, 2019 2:37 pm
Forum: Engine Tech
Topic: Looking for info on this intake SBC 377 Vortec Mercruiser tunnel ram
Replies: 8
Views: 555

Re: Looking for info on this intake SBC 377 Vortec Mercruiser tunnel ram

It's for the inboard ski boats. The MerCruiser Black Scorpion MX 6.2L MPI. Lower intake is part number 807352A12. Short of finding one on ebay, call Edelbrock and see if they have any more lying around. MerCruiser, afaik, quit that project years ago. Dunno if any of that helps or not.
by dannobee
Mon Nov 25, 2019 10:19 am
Forum: Engine Tech
Topic: Valve spring setting for turbo boosted engines ?
Replies: 28
Views: 1537

Re: Valve spring setting for turbo boosted engines ?

The one that comes to mind is the early porsche 930 turbos. Same valve sizes as the NA cars, same valve spring and retainer, same valve length. The intake and exhaust valve spring installed height was 1mm less on the turbos. Difference was made up with a couple more 0.020" shims under the valve spri...
by dannobee
Sun Nov 24, 2019 7:13 pm
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 39
Views: 1477

Re: low buck junk SBC

rebelyell wrote:
Sun Nov 24, 2019 6:13 pm
OE Iron Vortec L31 heads have straight conventional springs but no dampers.
spring GM pn 10212811 ... 80 lbs on seat, retainer GM pn 10241744
You're right, I must have been thinking about the LS engines.
by dannobee
Sun Nov 24, 2019 7:01 pm
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 39
Views: 1477

Re: low buck junk SBC

L03 & L05, in trucks, were called Vortec. I believe they were the first to use the name along with the TBI 4.3 of the same era. It didn't denote anything special or different from the same engines used in cars, it was just a truck badge-marketing thing. It wasn't pushed hard like in later years wit...
by dannobee
Sun Nov 24, 2019 6:18 pm
Forum: Engine Tech
Topic: Rod side clearance oil squirting?
Replies: 45
Views: 1179

Re: Rod side clearance oil squirting?

Expanding on what Kevin said regarding piston cooling, the Porsche 962's had pistons that were Mahle forged two piece welded affairs with a cooling channel just behind the ring package that was cooled with oil sprayed via a straight tube squirter into the hole drilled in the piston, along with the "...
by dannobee
Sun Nov 24, 2019 3:31 pm
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 39
Views: 1477

Re: low buck junk SBC

What was the RPO on those vortec V8's, pre '96? V6, sure, the L35 vin code "W" CPI engine that had all of the injector poppet nozzle problems.

My memory might be slipping, but I don't remember any vortec V8's before 96.
by dannobee
Sun Nov 24, 2019 8:45 am
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 39
Views: 1477

Re: low buck junk SBC

When I say "Vortec," I'm referring to the L31, vin code "R" engine with either 906 or 062 casting number cylinder heads, with 4 intake manifold bolts on each cylinder head. The others (other than the V6 that said "vortec" on the plastic valve covers), were not "vortec" but did have high vortex swirl...
by dannobee
Sat Nov 23, 2019 11:57 pm
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 39
Views: 1477

Re: low buck junk SBC

Vortec heads had beehive springs with smaller retainers. And didn't have valve rotators.
by dannobee
Sat Nov 23, 2019 1:05 pm
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 39
Views: 1477

Re: low buck junk SBC

Do you have the cam retainer plate? Is the 94 block machined for it? Does the cam have the fuel pump lobe? I thought those cams were missing the fuel pump lobe since all of the vortecs had electric fuel pumps. Also, the blocks have the pad for the fuel pump but none of the holes were drilled. Make s...