When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
@TooManyToys. We do want to get core engines back but we also want to get our engine shipping containers back. Over an 18 month period between January 2019 and June 2020, we lost 70 shipped containers that weren't (and still haven't been) returned. They cost a little over $400.00 each so were talking close to $30,000.
We set up and pay the shipping on the return shipment so there's no reason not to return them but when they don't, we have $400.00 to buy a new crate and money to buy a core engine to replace the one that we owned and used to build a customer's engine.
Many engine builders charge less so the customer doesn't send it back when they find out that it will cost them more to send it than what was charged. Those companies make money doing that but eventually, everybody will run out of good blocks and heads to build engines because they will be scrapped by the people who don't send them back.
@LindenBruce@TooManyToys. We can deck the block for an additional $200 because decking the block also requires that all of the pistons have to be cut. We don't deck blocks that don't need it done and we have any head gasket issues with the long blocks that we build.
I have no problem with you wanting a core back, or a charge for the shipping container. If I bought a block from you I’d be shipping the container back even if was empty. That’s your property. The fact that people are not doing that, I guess you should have a deposit for that too. I’m glad to hear you use a container for protection.
So you are saying the typical engine is at the piston protrusion limit of 0.0354” from the factory? Or are you targeting less profusion for safety? I know one rebuilder who targets 0.025” just to be safe.
@TooManyToys. The compressed head gasket thickness is .059 and the valves are recessed in the cylinder heads .025. A good machinist could drive a semi truck through with that much clearance.
Well, Gasket Thickness + Valve Recession - Piston Protrusion, and throw in the cam timing and lift, and that semi might have a little problem getting under the bridge.
What are you projecting your Stage 2 piston to valve clearance to be with the 0.025" valve target?
Regardless of who I buy from, I'm NOT keeping my old block. I need it lying around like I need another hole in my head. Nor will I be keeping any shipping crates. Need those even less.
Interesting question on how much valve clearance there is with stock piston height with a Stage 1 or Stage 2 cam. B.
@TooManyToys. The compressed head gasket thickness is .059 and the valves are recessed in the cylinder heads .025. A good machinist could drive a semi truck through with that much clearance.
So, what would the valve to piston clearance be with a stock lift cam? B.
Regardless of who I buy from, I'm NOT keeping my old block. I need it lying around like I need another hole in my head. Nor will I be keeping any shipping crates. Need those even less.
Interesting question on how much valve clearance there is with stock piston height with a Stage 1 or Stage 2 cam. B.
U agreeIand in my case I don't need extra clutter. I have more than my fair share.
@TooManyToys. I'd have to do some Trigonometry to figure all of that out again. It was figured about 9 years ago when we first started building our own Stage 2 cam. We've installed roughly 2,000+ cams since then without any issues. There have been a handful of people who have had valve to piston contact when operating a high rev tune because high rev valve springs were not added to the build. If anybody would have a problem, it would be the guys with 800-1000+ HP engines that we've built but none have had any issues with valve contact that I know of. It's pretty simple, if somebody is running a high rev tune, they just need to add the high rev springs and heavy duty push rods. Without telling an engine builder what plans are, a person runs the risk of problems. Our stage 2 cam lift is .250 intake and .244 exhaust with the valve lift being .337 intake and .329 exhaust with a recommended 120# spring pressure.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.