Block Search--302
- Thread starter INDSKYS
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I think the only four bolt 302's Fors ever made were the Boss blocks(rare and expensive). There is an aftermarket company called Dart that makes a super strong 302 block with 4-bolt mains that can be bored out to .185 over as opposed to the .030 of a stock block. It runs over $2,000 for an unfinished block though. FRPP has some in between options.
I used a 1970 year Mexican block. It has a Mexican stamp in the lifter valley. These blocks are very strong. It is built like the 289 HI_PO block with the large main caps and stronger webing but also has more iron content. Im running 525hp with a paxton supercharger and had no problems. There are guys racing with this block and had lot of luck without spending 2300 dollars. There was a post in here somewhere about a racer who blown one apart but he was running a 250HP shot of nitrous with a total of about 850 hp and thats pretty darn good for a 2 bolt main, dont forget to use a stud girdle and ARP stud kit for a girdle.
66P51GT
New Member
SoCalCruising
Founding Member
Dart Machinery makes two 4-bolt main blocks. The Iron Eagle has four bolts on all mains. The Sportsman has 2-bolt mains at 1 & 5, and 4-bolt mains at 2-4. Max over-bore is 4.185".
World also makes aftermarket Ford 4-bolt main blocks. Max ocerbore is 4.2"
The Ford Racing R302 block is like the Dart Sportsman block, but has a smaller max. over-bore (4.125, I think - not positive).
You can occasionally find a Ford Racing A-4 block (predecessor to the R302 block). The A-4 is like the R302, but is non-siamesed. All of the other 4-bolt main blocks above are siamesed.
Try:
http://www.nmraracing.com/forums/forumdisplay.php?forumid=43
http://forums.funfordevents.com/forumdisplay.php?f=34
for on-line auctions, besides Ebay.
World also makes aftermarket Ford 4-bolt main blocks. Max ocerbore is 4.2"
The Ford Racing R302 block is like the Dart Sportsman block, but has a smaller max. over-bore (4.125, I think - not positive).
You can occasionally find a Ford Racing A-4 block (predecessor to the R302 block). The A-4 is like the R302, but is non-siamesed. All of the other 4-bolt main blocks above are siamesed.
Try:
http://www.nmraracing.com/forums/forumdisplay.php?forumid=43
http://forums.funfordevents.com/forumdisplay.php?f=34
for on-line auctions, besides Ebay.
Hack
15 Year Member
Not sure how familiar you are with Fords, but you don't need a 4 bolt main on a Ford to make good power with it.INDSKYS said:
Are you sure you really need 4 bolt mains?
How much power are you aiming for?
What power adders, what max rpm?
I Am Not A Ford Man By Any Means Have Had Chevy All My Life Till Now. Thus All The Questions I Know The Chevy Info Lol Four Bolyts Are A Dime A Dozen Hehe. Anyway I Looking For 550 To 600 Hp Stroke Of 331 Or 347 . All Parts Will Be Forged .the Power Will Come From A Paxton Enclosed Supercharger . It Will Be Boosted As High As Pump Gas Allows . The Car Will Not Be Raced Just A Fun Car . Reliability Is My Main Concern As The Car Will Be Driven On Long Trips Across Country .all I Ever See Here On Frums Is That 450 Hp Is Max With A Girdled Block--- 2 Bolt ?
LMan
Founding Member
Yeah your gonna want to go 4 bolt, check out my garage i split a 2 bolt main block a 570rwhp and 560 tourque, on a dyno thats how i know. i got the DART, 300 bucks machineing and it was done. I was told that the R-302 block is cheaper but the amount of machineing is much greater, and all around the dart was my best option, look @ my combo. Good luck dont skimp in the begining it will only come back to haunt you, take my word for it.
Everyone i asked said stick with the 331 with high boost. But since then i have talked to alot of guys with 347's and no probs even one with 28lbs of boost! I just said well 16 more cubes wont be noticed when you #'s are up there, and i went concervitive. (that was the first time and only time that happend)
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