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Building A Nostalgic 1970s Fuelie Headed 350 SBC

General engine tech -- Drag Racing to Circle Track

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vortecpro
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Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by vortecpro »

Building a 4.060 X 3.480 360 inch SBC, 618 2 bolt block, factory 5.7 rods, cast factory crank, flattop pistons, 2.02 fuelie heads, solid flat tappett cam, .515 lift @ valve, 242 @ .050, 108, installed @ 104. Air gap intake, Milodon Chevy II oil pan. Dyno test Monday. Looking for a 10 sec Chevy II.
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by ClassicRob »

461X heads and 10’s? I love this site!
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by vortecpro »

On Wialliamson and Booty's Rd at that........
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by F-BIRD'88 »

Define "Chevy II"
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by vortecpro »

F-BIRD'88 wrote: Sun May 02, 2021 3:01 am Define "Chevy II"


"Will be a a 10 sec Chevy II"
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by Tom Walker »

In the assemble stage now building something very similar. 1970 LT-1 "186" heads, 1972 LT-1 intake I have had for a while, speed pro 2304 Pistons that are basically the old 11-1 slugs for the 1970 LT-1 engines. Scat 5.7 rods, attached to a cast one piece crank out of a 1996 Z28 with the second gen LT1. Using a G.M. Second gen LT-4 "Hot Cam" ,hydraulic roller, believe I am done with flat tappets!
All of this going into a 1996 "880" vortec roller block, painted Chevy orange.
Hoping for high 10s also, but meaning about 10-15 minutes down the road to the nearest rod run, not a serious power producer, just an effort to drag the past into the future.
Low tech and fairly low budget, but high fun and highly reliable! Just the way I like it.
1973 Z28 Camaro, Green/Black stripes, 4 speed.
Maybe a little older but still making noise, keeps my spirit young!
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by HDBD »

Best of luck to you Vortecpro. Seems like a stretch but if anybody can pull off miracles it is guys that race in stock.
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by vortecpro »

Tom Walker wrote: Sun May 02, 2021 9:39 am In the assemble stage now building something very similar. 1970 LT-1 "186" heads, 1972 LT-1 intake I have had for a while, speed pro 2304 Pistons that are basically the old 11-1 slugs for the 1970 LT-1 engines. Scat 5.7 rods, attached to a cast one piece crank out of a 1996 Z28 with the second gen LT1. Using a G.M. Second gen LT-4 "Hot Cam" ,hydraulic roller, believe I am done with flat tappets!
All of this going into a 1996 "880" vortec roller block, painted Chevy orange.
Hoping for high 10s also, but meaning about 10-15 minutes down the road to the nearest rod run, not a serious power producer, just an effort to drag the past into the future.
Low tech and fairly low budget, but high fun and highly reliable! Just the way I like it.
1973 Z28 Camaro, Green/Black stripes, 4 speed.
Maybe a little older but still making noise, keeps my spirit young!
Good for you!
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by vortecpro »

HDBD wrote: Sun May 02, 2021 10:46 am Best of luck to you Vortecpro. Seems like a stretch but if anybody can pull off miracles it is guys that race in stock.
Thanks I guess.........seems easy to me. I really think this engine could run 11.60s in my 1/2 ton C-10 truck @ 3960, thats what it was originally built for.
For discussion sake, 327 NHRA Chevy IIs consistently run 10s in stock, they can only dream of having the kind of power I'am going to make. I know my short block looks "plain" to some, but really its not.
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by HDBD »

I am sure it is far from stock. Been there and done that in Jr Stock many decades ago. But that was with a cam that took out heads after 9 runs thanks to Harold at General Kinetics. Purposely floated the valves to coil bind, ug
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by ClassicRob »

What’s the deal with these later blocks anyway, some say they are thinner, others say the later 70’s 010’s are thinner...


Wish we had more certain answers.
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by vortecpro »

HDBD wrote: Sun May 02, 2021 11:31 am I am sure it is far from stock. Been there and done that in Jr Stock many decades ago. But that was with a cam that took out heads after 9 runs thanks to Harold at General Kinetics. Purposely floated the valves to coil bind, ug
Did a JR stock 350 have a 1600 gram bob weight, or a 1.2 MM ring, or counterweights cut .300 ? :D Then theres the heads................
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by Tom Walker »

Good luck to you VortecPro, will be very interested to hear of dyno results.
Beautiful car in the picture.
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by Tom Walker »

Also in my first post I should have clarified with " in the process of assembling something similar Looking"', sounds like you have a much bigger goal as far as results expected. Very interesting builds when people race the old iron and achieve the results you do, keep pushing, it's awesome.
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Re: Building A Nostalgic 1970s Fuelie Headed 350 SBC

Post by rustbucket79 »

ClassicRob wrote: Sun May 02, 2021 11:34 am What’s the deal with these later blocks anyway, some say they are thinner, others say the later 70’s 010’s are thinner...


Wish we had more certain answers.
For a regular .030” oversize deal you can’t go wrong with any of the production blocks given a reasonable power (stress) build. What will function and what we perceive as required cylinder wall thickness is a huge grey area. (Again, goal relative)

I can tell you a sonic tester can amaze you with what has worked (460 block, .080” over, 4.3” crank, and over 300 of spray in a mud bogger came in for a refresh, little did the customer know he had bent an H beam rod at some point in the season where the beam machined the bottom of the bore 2 clearance grooves, yet the cylinder was round and honed just fine. IIRC it had around .090” on the non thrust.

The mid year 350 blocks were all pretty terrible, the early blocks are becoming very difficult to find, so the 1 piece seal blocks are the future. They will sonic thin on at least a few non thrust walls typically but for an average build, go .020” or .030” over and you’re fine.
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