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Search found 14 matches

by hairyclive
Sun Feb 23, 2020 12:59 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

Recently discovered SVO NAscar V6 heads have almost same bore placing as stock 4.2/4.9 (4.469 vs 4.48) a little bit of juggling with the rebores and cut the end off a couple of SVO V6 heads and you have an engine with enough airflow capacity to make 4-600 HP if you can rev it high enough (the heads ...
by hairyclive
Wed Aug 07, 2019 4:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

Found this while looking around
all kinds of info for head conversions
https://www.jalopyjournal.com/forum/thr ... 478/page-2

clive
by hairyclive
Sun Jul 07, 2019 2:45 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Overheating. Not timed or tuned. Good Tutorial?
Replies: 10
Views: 1181

Re: Overheating. Not timed or tuned. Good Tutorial?

I can replace any part on this truck and have but... I know next to nothing about set up. >1. My timing is probably off. I understand I'll need to get a vacuum gauge. Preferences? Any direction on a good tutorial on setting up correct distributor timing? drive with the vacuum guage installed about 1...
by hairyclive
Wed Jun 26, 2019 12:35 pm
Forum: 240-300 "Big Block" Six Performance
Topic: is detonation related to operating temp?
Replies: 3
Views: 731

Re: is detonation related to operating temp?

Yes
actually a number of factors
engine design
fuel quality
comp ratio
spark timing
load on the engine
all of these affect pin/knock/detonation
that is why most high load engines have low comp
there are probably a number of articles if you search the Hot Rod mag site on this topic

clive
by hairyclive
Mon May 06, 2019 6:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

found interesting table of port comparisons for many heads
includes several aftermarket as well
this guy has some other good stuff at his site too

clive
http://users.erols.com/srweiss/tablehdc.htm
by hairyclive
Mon Apr 29, 2019 12:34 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

54-4x4 » Sun Apr 28, 2019 8:12 pm hairyclive,have you made any progress on your engine design project? I have been a little sidetracked by some other stuff, like life getting in the way I spent a while looking at large v twin motorcycle heads as a possible cut and paste structure found a couple in t...
by hairyclive
Sat Apr 20, 2019 12:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

I suppose with the ability to copy an actual head or block etc. it might be possible to mix and match various designs and place the best combustion chambers, ports,valve angles,headbolt locations,cylinder bore centers,cam locations,main bolt girddles , etc. into one head and block to work in harmony...
by hairyclive
Fri Apr 12, 2019 4:54 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

by swiss cheesing the block offsetting the bores and using some diesel wet sleeves machined and siamesed it might be possible to go up to a 4.7" bore. and leaving .200 walls offset boring across the block could make the thrust side thicker than the coast side leaving about .250 thrust .200 side...
by hairyclive
Mon Apr 08, 2019 2:56 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

--- by pmuller9 » Mon Apr 08, 2019 12:37 pm Hi Clive Thanks for your reply. Here is where you have everyone including me scratching their heads. If you take six 5.00" sleeves in a row on 4.9" centers the total sleeve length is 29.4" (29.5" if you leave the end sleeves round on th...
by hairyclive
Mon Apr 08, 2019 12:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

"I still would like to hear from Hairyclive and find out for sure what the thinking is here." pmuller the original Idea was to maximize available bore space in the stock block casting that is why I was talking about making 5" holes on 4.9" bore centres and installing siamesed lin...
by hairyclive
Fri Apr 05, 2019 10:17 am
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

While we are on this topic check this out https://www.hotrod.com/articles/how-to-build-your-own-sheetmetal-engine/ This guy got tired of modding inadequate stock parts and just welded and machined his own 700 HP 4 cyl OHC engine. OK what I said was the correct numbers the block is in theory capable ...
by hairyclive
Thu Apr 04, 2019 3:57 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Re: Has anyone ever built something like this?

posted earlier by swiss cheesing the block offsetting the bores and using some diesel wet sleeves machined and siamesed it might be possible to go up to a 4.7" bore. and leaving .200 walls offset boring across the block could make the thrust side thicker than the coast side leaving about .250 t...
by hairyclive
Mon Apr 01, 2019 12:28 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Has anyone ever built something like this?
Replies: 51
Views: 4790

Has anyone ever built something like this?

BTW has anyone got internal engineering drawings for the block listing bore thickness and showing core placements? Flyer have you got this in your collection? BTW marine engine rebuild catalogs have lots of info including casting numbers for most engines Mahle master catalogs are loaded with stuff. ...