Recent content by superdart360

Just to clarify. This issue has been resolved. The engine has about 200 miles on it with no issues. It was a combination of poor shop work and a lack of attention to detail. Lots of lessons learned. Biggest issues was with the springs. They just where not strong enough. Also the heads had many...

You are correct the stock pushrod holes where way to small. This motor is a hyd roller and when we originally placed the heads on the block the pushrods would bind. We bored them out to 5/8 inch. We have not had any clearance problems.

I wanted to follow up with this thread to post that the problem was finally resolved after 4 different shops worked on the heads. This is how the shop explained it to me, I am posting this hoping it will help someone that ever may be in a similar situation. The 71J Heads were designed for a...

yeah... thats the issue. I drove the car marbe 20-30 miles the first time before it happened, and this time about 5 miles. There was no issues until higher RPM. So either the valve is getting bound up in the guide and the piston is smacking it. Also another note to make is that this only...

cam specs .520-.544 lift 222*-228* @.050. Hydraulic roller cam Last time this happened the piston had a very small eyebrow in it. Timing was 14 advanced.

it is a 1990 block, lower compression block than 70's 80's. When I had the heads off and brought one of the pistons to TDC it was near 1/2 inch from the top of the cylinder. It is not a magnum block though. that didn't happen I think until 92 for the 360's. I would guess guide as well but...

I was just told it would not be a problem with the stock bottom end because the factory pistons had plenty of clearance. And if that was the problem wouldn't it happen to other valves as well? I am learning this stuff the hard way. And as far as cam timing I will look into that. That would...

So it's been about a year of fighting with these heads. Had them on and off the car 3 times. At this point i'm not sure what to do with them. Need some advise here. So the deal is I bought these heads a year ago. Took them to a engine shop to check them out and assemble them. they are 71J...

Hey thanks everyone for all the help finally got it resolved and the car is running again! 92 Roller Cam 360 with 71 J heads and a killer cam! Here is a video of the new sound! http://www.youtube.com/watch?v=aTJD833lPyc

Great advice. Thanks for the help. I think I will focus on trying to keep the heads and get them drilled out. I really appreciate all the help! I will keep you posted with the progress.

Stock 92 Roller cam head with 5/8 Push rod holes. Look at the distance from the edge of the head. Then look at the other picture. Not only is it smaller on the 71 but its closer to the edge. 71 J Head. 7/16 push rod hole. Hole is right against edge of head.

Yeah the stock heads that came off the 92 had 5/8" holes for the pushrods. The rockers are in the same place as stock. I threw the stock set of rockers off the 92 onto the 71 head and had the same issue. The issue with drilling it out to 5/8" is the 92 5/8" hole is offset about 1/8 inch toward...

Yes they are but that is a separate issue! lol. If they where the right length they would not line up. I was showing that picture to show how much the offset difference between the heads are.

This is a 92 Roller cam la block. Not a magnum. Pushrods are 6.35 in length. Harland and sharp 1.5 ration roller rockers. The problem is that with the roller cam the lifters are much longer than that of a non roller cam. So by making the pushrods shorter it takes more angle for the pushrods to...

I found a nice set of 71 J heads on craigslist for my 92 360. Heads came with Double Springs, Long Stainless Valves, All the work had been done to them. Just need to be assembled. So I had the machine shop check them out and assemble. I also ordered a cam now that I could accommodate for a...