I agree that the 351c is an excellent proved engine almost for any car racing but there are few things I would like to bring up.
7.0 liter engines were dominating Nascar until Nascar wanted the hp/topspeeds down. Have you ever heard of restrictorplates? Those plates were invented 1970-1971 for the big powerplants like the Hemi’s and 429 Boss’es to bring the speeds down. Nascar had a complicated rules for racecars using bigblocks and that was the time when Bud Moore for example found out that by using smaller 351c they could get rid of the restrictions that were made for 429 cars like the restrictor plate & sanctioned extra weight. By the rulechanges Nascar practically ruled the 7.0 liter engines out of the competition, this is the main reason why 351c was better choice for Ford racers than the 429 Boss.
There’s nothing magic that generates more hp in 351c than the bigger engines, but the 351c is an excellent hipo engine – like the 429/460. If you’re a diehard 351c fan you might want to get familiar with the 429 CJ engine. They share many things, they’re like small and bigbrother. Thin casting, huge heads, short stroke, similar oiling etc.
429 Boss surely was a high dollar racing engine. 429 CJ was significantly cheaper to produce and would have been close in hp probably, but the Boss 429 was the big gun against Mayflower Hemi’s.
I am not bashing the 351c, it is still one of the Fords cool hiperformance engines and it’s name also sounds like action instead of ol’ rotten castle in Britain… meaning Windsor
It is the extra 78 cubes that makes the difference. 351c has 3.500” stroke, 429 has pretty close similar stroke with 3.590” stroke, only bore in 429 is obviously bigger 4.360” instead of 4.000”. I also agree with the writers that the Ford’s decision practically to close the racing operations made wonderfull things to be shut down in 1970 – that is a shame.
I had myself a healthy 351c 4V in my Mach 1 when I bought it. It was tweaked to 430 hp and it made some nice power for the street. It wasn’t an bad engine at all, it made nice power, it revved like a grazy, sounded like ready to kick every chebby a$$, it smoked the tires through all gears when stomped. Overall it was an nice engine but no match for current built 460 SVO engine – not due to overhelming excellence of the 460 but due to +100 cid difference. Jon Kaase was told by Engine Masters not to attend anymore with CHI headed engines to the competition, Jon proved that the sbf with cleveland based CHI heads were nearly impossible to beat in Enginemasters.
Just something to think off and as said I am not trying to take the 351c thunder off from you, no sir.