Thread: stroking a MKIV 2-bolt main?

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Look at this thread before even thinking about converting to splayed caps. It's a big undertaking and for almost all engines short of full-tilt dragsters it's not necessary.

Splayed 4 bolt upgrade

Note that Pro-gram link is defunct - go instead to American Made - American Proud: Pro-Gram Engineering Corp - Manufacturer of Race Engine Parts - Home

Originally Posted by glennsexton

Look at this thread before even thinking about converting to splayed caps. It's a big undertaking and for almost all engines short of full-tilt dragsters it's not necessary.

Splayed 4 bolt upgrade

Note that Pro-gram link is defunct - go instead to American Made - American Proud: Pro-Gram Engineering Corp - Manufacturer of Race Engine Parts - Home

milodon cap or howards make caps now its not a big deal i done many of the 2 bolt to 4 it is more of a time deal if you have it done they need to watch were they drill as they can open up a main feed to the main . if you know your going past 700 hp then just buy a big m block when all siad an done you would be very close to 700.to800 cap job fitting the caps drill and tap block aline bore easy 400. and caps are 240 for the 3 main caps in milodon 400 for howards cap 1threw5 . as for Pro Gram there cap are some of the best and howards are right there with them . i am dealer for program and howard my catalog 2012-13 shows there still making caps ? not sure they were off line i hope there back up and runing i use to buy timed out off shore race blocks. just about all them had program caps but dart makes there own caps and many do so that may have been a big cut in them making caps

thanks guys,

- I wanted to try and keep it a 2 bolt main at most maybe a stud girdle.
- curiosity was more or less to see if I could turn a two bolt main into a 511or if anyone had tried this (496 shouldn't be a problem for the main caps) was just thinking of doing something different
- if not maybe just try to put a new rotating assembly (possibly a 496) in with some lighter rods and higher comp. pistons. take it up to 7000rpm
- ultimately I want to have fun and kind of push the limits in an affordable way at most replacing the rotating assembly and valvetrain
- kind of had my heart set on trying to stroke it to 511 if possible - wondering if a machinist had tried this and if the main caps could handle it if so - I would love to try it!

7000 not a big deal for the bottom end if you keep a eye on parts valve train is the biggy . try some thing new ? well for you but your taking about a engine thats been built from 1965 what ever you think of its been done .there is no if i could i done it many time its more if you can find someone or yourself could. its not to big of a deal like said its the cost. i been building bbc for many years and using two bolt blocks the 511 to 496 has nothing to do with the main caps. i put many street/strip 496 together with a 454 two bolt block and had one customer used a two bolt 454IV block to 496 in a pull truck were he had it for over five years of pulling with just ARP studs in the two bolt mains. first time he built it last time i did caps did not move this engine was making steam up to 7500 every pull .i have done over 40 of the 4.250 9.800 deck builds its not much of a deal. but you still need to know what the hell your doing better have more then just a few builds under your belt . even after building 100s of engines the brain drop in to Neutral so a build like this takes time it not like baking cookies