Building a stroker motor

[RacerM95]

my last SBC was a 350 4 bolt main block (69 Corvette) 202/160 Heads Custom Ground Comp Cams Cam. High Rev Hydraulic Lifters, Comp Cams Roller Rockers. Worked out well in an 83 Monte Carlo

 

[rebelyell]

suggestion: if ya go more than 3.8" --- suggest go to a bigger bore like OE or aftermarket "400" piece.
They breathe so much better with a larger bore; bigger bore helps unshroud the valves, it matters. No doubt the shrouding effect can only be increased by a 4" stroke in a 350 block.
Of course, the aftermarket blocks are designed to accommodate larger strokes.

JMO, I'd rather have a more-carefully executed 355, than a plain white wrapper 350 stroked to 383/388.

FWIW, Long ago, I built a 4.030" std deck 2pc rms block x 3.8" (scat) 388ci; 5.7" pink rods and std base circle HFT cam. It did Require cam-clearance the top of some rod bolts. I'd already balanced it for spec rod weights --- so I clearanced All 8 rods to match. Plenty aftermarket rods $$ could have fit without mods.
Since then, but still Long ago, I've gone to pistons with thin, metric ringpaks. Haven't looked back.

 

[Schurkey]

I'd rather have a 4.125" bore, 3.75" stroke 400 small-block than a 4" bore, 4" stroke "400" small-block.

The issue is finding a decent 400 block any more.

 

[99xcss4]

if I had unlimited funds I would have a aftermarket block with a minimum of a 4.185 bore and maximum of a 4.250 bore and a stroke of 4.250

 

[99xcss4]

if I had unlimited funds I would have a aftermarket block with a minimum of a 4.185 bore and maximum of a 4.250 bore and a stroke of 4.250

I would want to use these heads https://www.summitracing.com/parts/flk-1220hrcnc505/make/chevrolet or maybe a set of one of these https://www.summitracing.com/compare

 

[Erik the Awful]

The cost and complexity of a 383 is not a significant hurdle. The price and complexity of stepping up to a 4" stroke makes a big block more attractive. The crank itself might not be much more expensive, but everything else that's required is.

 

[Blue Max]

I went to the DART SHP blk 4.125" bore and 4.0" stroke. Had to get custom pistons to keep the compression in the 9.46:1 static range. COVID time frame and it took 9 months to get the pistons done. All said [email protected] and 560ftlb@4K. Still using the MPFI type spider (48lb/hr) and OEM Throttle body. Really nice to have all that Trq makes climbing the mountain passes a breeze. It only $$$$ cant take it with you.

 

[Vikingdude]

I went to the DART SHP blk 4.125" bore and 4.0" stroke. Had to get custom pistons to keep the compression in the 9.46:1 static range. COVID time frame and it took 9 months to get the pistons done. All said [email protected] and 560ftlb@4K. Still using the MPFI type spider (48lb/hr) and OEM Throttle body. Really nice to have all that Trq makes climbing the mountain passes a breeze. It only $$$$ cant take it with you.

I like hearing this. The generally accepted limit of the stock spider seemed to be around 400hp. I'm currently working on a 383 with the stock mfpi spider and a very mildly ported stock intake/throttle body. Did you install a larger fuel pump to feed the beast?

 

[99xcss4]

I like hearing this. The generally accepted limit of the stock spider seemed to be around 400hp. I'm currently working on a 383 with the stock mfpi spider and a very mildly ported stock intake/throttle body. Did you install a larger fuel pump to feed the beast?

the higher psi mpfi spiders are very expensive 305 350 https://www.ausinjector.com/categor...rmance/chevrolet/k1500/v8-5-7l/1996-99-3.html 4.3 https://www.ausinjector.com/categor...rmance/chevrolet/k1500/v6-4-3l/1996-98-3.html

 

[rebelyell]

if I had unlimited funds I would have a aftermarket block with a minimum of a 4.185 bore and maximum of a 4.250 bore and a stroke of 4.250

If I had unlimited funds I probably wouldn't be screwing around w/ $10K pickups.
That said, if ya want truly BIG inch sbc, our kiwi friends were doing a 600" sbc for jetsprint race boats. JMO, there's little more ballsy than jetsprinting except Isle of Man TT mo'cycle races (rather lethal, June 2024).
Major jetsprint venues at NZED; although some in USA's PNW.

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Technical - Peter Caughey Racing - Jet Sprint Team

Technical Engine Type V8 Billet aluminium super-tall-deck, big bore, Small Block Chev. (only one of its kind on the planet) Displacement 600cuin (9.6 Litres) Fuel “PURE” Methanol Injection Engler (billet alloy) Custom made (biggest injection manifold ever made for a SBC). Cylinder Heads Insanely...

www.pcrjetsprinting.com

Stateside, CFE has followed-on with their 600" sbc