![69 corvete rodstar 427 ford 69 corvete rodstar 427 ford](http://findclassicars.com/uploads/carphotos/69-vette-conv-373-miles-lemans-blueblue-l71-435hp-f41-ps-pb-side-exhaust-9.jpg)
I think you run the risk of splitting one or more cylinders if you go to a 4.050 bore, but if you don’t, with a 4.000 stroke, you get 412.24 cubic inches (6,755.40 cc). Here’s the thing: if you don’t want the valves shrouded, you’re still going to need about a 4.080 bore, which puts you into either a sleeved block or an aftermarket block - and if you’re that far in, just jump up to the 460 and start modding from there.įollowing the convention of “bore x stroke”:Ī 4.000 x 4.000 is a factory combo that makes 402.12 cubic inches (6,589.63 cc).
#69 corvete rodstar 427 ford pro
You can buy “Cleveland” heads with better angles and ports these days, but if you’re not a pro racer, they’re probably not worth it if you can’t use your original rockers, manifold and headers. In the early 1970s, NHRA Pro Stock allowed (tolerated?) repositioning of the valves, tubes where the exhaust ports used to be - lots of modifications normal people would consider insane. If you’re hoping to unshroud the valves, you need a bore around 4.155 with stock heads and you can get that down to around 4.120 if you’ve got some excellent head work. If you’re going past 0.030, have each bore sonic-checked. (B) The tall-deck Cleveland block is ginormous, but it is still a thinwall casting. If it needs a 0.030 on the first rebuild, it’s been deliberately abused for a very, very long time. (A) Ford blocks are VERY hard when contrasted against blocks from other US makes, and usually will not need a bore job after 400,000 miles if they have been well-kept, but “reasonably well-maintained” blocks might need 0.010 after 250-500 thousand miles, depending.
![69 corvete rodstar 427 ford 69 corvete rodstar 427 ford](https://cimg7.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/1200x900/00f0f_cmncz46aixq_1200x900_ba1dde338318bb6376f60ba8dd6414fa91528788.jpg)
Second: 0.050 over is crazy in those blocks for a couple of reasons: You could buy FE blanks and have them machined with Cleveland crowns - but why not just buy Cleveland pistons and save yourself the headaches and cost? That pesky little item can be a PITA to find.įirst off: the valve geometry of the FE head is completely different from that of the Cleveland, so the valve reliefs will be all wrong. Jeff is right about just swapping-out the crank and pistons however, you will also need the damper for the 400. Turn rod journals to 2.375" with RB Chrysler 6.768" rod.Turn rod journals to 2.200" with Big Chrysler 6.535" rod.No Mallory metal required for balancing.Requires aftermarket rods similar to 1.9L 4-cylinder rods.Ford Stroker Engine Bore and Stroke Guide