FrankR
Web Wheeler
Reged: 02/01/04
Posts: 10224
Loc: Columbia, SC
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Re: Bob's 3.0L Engine
08/03/07 07:40 PM
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If the on-line information I've found is correct, there is a difference in the Chrysler mini-van camshafts as compared to the SOHC Montero/Raider, but it appears to only effect the pre-roller cam years:
Montero/Raider
Compression Ratio = 8.9
Valve timing
intake open... 19* BTDC
close..........59* ABDC
exhaust open...59* BBDC
close..........19* ATDC
Chrysler version - '87-at least '89
Compression Ratio = 8.85:1
Valve timing
intake open....19* BTDC
close..........57* ABDC
exhaust open...57* BBDC
close..........19* ATDC
I believe all of the above Chrysler specs are for non-roller cams. I think a change occurred in '90 or '91, but certainly by '92, the roller cams were used and appear to be the same as used in Montero/Raider:
Chrysler version - '92
Compression ratio = 8.85:1
Valve timing
intake open....19* BTDC
close..........59* ABDC
exhaust open...59* BBDC
close..........19* ATDC
Anyway, I'd say if the mini-van SOHC heads have roller cams, the cams are identical to the Montero/Raider cams. If the sprockets are swapped, it would be wise to check the dowel pin locations for TDC alignment against the timing marks, but I'd bet those will match up.
Frank
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'89 G-Raider Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 155k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, 165A alt., Lifeline AGM, Rust-Oleum
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